Kamathan the Bargainer

This spell costs {2} less for each card you've
discarded this turn. When Kamathan enters the
battlefield, discard you hand, then draw 4 cards.
It deals X damage to any target, where X is the
number of cards you've discarded this turn.
Kamathan and other Demons and Dragons you control have haste and flying.
Partner (You can have two commanders if both have Partner.)